[Bluez-devel] RFCOMM non-blocking support

["Victor Shcherbatyuk" <victor@win.tue.nl>]

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Hi Marcel,

This was already discussed a year ago:
question:
http://sourceforge.net/mailarchive/message.php?msg_id=8643791
reply:
http://sourceforge.net/mailarchive/message.php?msg_id=8643793

I have exactly the same problem, I guess.

Instead of EINPROGRESS non-blocking connect() returns EAGAIN (Resource 
temporarily unavailable). The rest seem to be OK (see the source). Select 
waits till the connection is established or an error occurs (at least as it 
looks from hcidump log).

Regards,
      Victor. 

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#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/rfcomm.h>

int btopen( const char* addr, int chan )
{
	struct sockaddr_rc remote_addr, local_addr;
	bdaddr_t bdaddr;
	int s, r;

	str2ba(addr, &bdaddr);
	if ((s = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)) < 0) {
		perror("socket()");
		return -1;
	}

	memset(&local_addr, 0, sizeof(local_addr));
	local_addr.rc_family = AF_BLUETOOTH;
	bacpy(&local_addr.rc_bdaddr, BDADDR_ANY);
	if (bind(s, (struct sockaddr *)&local_addr, sizeof(local_addr)) < 0) {
		perror("bind()");
		close(s);
		return -1;
	}

	if ( fcntl( s, F_SETFL, fcntl( s, F_GETFL ) | O_NONBLOCK ) < 0 )
		perror("fcntl()");

	memset(&remote_addr, 0, sizeof(remote_addr));
	remote_addr.rc_family = AF_BLUETOOTH;
	bacpy(&remote_addr.rc_bdaddr, &bdaddr);
	remote_addr.rc_channel = chan;
	if ( r = connect(s, (struct sockaddr *)&remote_addr, sizeof(remote_addr)) < 0)
		perror("connect()");
	
	//here returns -1 with EAGAIN (11) = Resource temporarily unavailable
	//EINPROGRESS is expected???

	return s;
}

int main( int argc, char** argv )
{
	int fd, r;
	fd_set wfds;
	socklen_t optlen;

	if ( argc < 3 )
	{
		printf("Use: bluetalk <address> <channel>\n");
		exit( 1 );
	}
	printf("Opening socket...\n");	
	if ( ( fd = btopen( argv[1], atoi( argv[2] ) ) ) < 0 )
		exit(1);

	printf("Waiting for open completion...\n");
	r = select(fd + 1, NULL, &wfds, NULL, &tv);
	if (r<0){
		perror("select()");
		close(fd);
		exit(1);
	}
	else
		printf("success\n");

	//check if connect() succeded
	getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&r, &optlen);	
	//here  r=0 in case of success or r=errno otherwise
	printf("len=%d, r=%d\n", optlen, r);

	printf("Closing socket...\n");
	close( fd );

	return 0;
}